Someone on Mastodon @'d my Lemmy account. how is this possible? I though Lemmy and Mastodon are seperate from each other?

pic unrelated

      • ChaoticNeutralCzech@feddit.org
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        8 days ago
        The MD of your comment as seen on Lemmy
        [@ChaoticNeutralCzech](https://feddit.org/u/ChaoticNeutralCzech) [@asklemmy](https://lemmy.world/c/asklemmy) [@[email protected]](https://lemmy.world/u/Zak) 
        
        That's true from Lemmy, but not from Mastodon. Mastodon won't detect [email protected] as a mention. 
        
        I'm curious as to how Lemmy handles collisions from external sources. [@cat](https://lemmy.world/u/cat) exists as both a user and a community. Since this is a comment, Lemmy shouldn't post it to the community, but will Lemmy users see a link to the user or the community?
        

        The @cat mention became a hyperlink to the user page.